refactor: [FC-0074] address docs reviews

[mariajgrimaldi]

Description

Improve how-to docs based on reviews:

• Update filter in create-new-filter to match latest standards: https://docsopenedxorg--260.org.readthedocs.build/projects/openedx-filters/en/260/how-tos/create-a-new-filter.html#step-5-implement-the-filter-definition
• Add note about docstring specification ^
• Add sample code for triggering filter: https://docsopenedxorg--260.org.readthedocs.build/projects/openedx-filters/en/260/how-tos/create-a-new-filter.html#step-6-trigger-the-filter-in-the-application
• Fix sample code from create-pipeline-step: https://docsopenedxorg--260.org.readthedocs.build/projects/openedx-filters/en/260/how-tos/create-a-pipeline-step.html#step-3-create-a-pipeline-step
• Format sample codes
• Add note about annotating arguments and return

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Merge Checklist:

• All reviewers approved
• Reviewer tested the code following the testing instructions
• CI build is green
• Version bumped
• Changelog record added with short description of the change and current date
• Documentation updated (not only docstrings)
• Code dependencies reviewed
• Fixup commits are squashed away
• Unit tests added/updated
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post Merge:

• Create a tag
• Create a release on GitHub
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

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[mariajgrimaldi]

@BryanttV, thank you so much for the feedback! Here's the PR with the suggested changes for you to review :)

[sarina]

Is there a shortlist of modes, or can it be anything? I don't remember how enrollment works.

[mariajgrimaldi]

There is a shortlist of modes: https://edx.readthedocs.io/projects/open-edx-building-and-running-a-course/en/latest/glossary.html#enrollment-track-g. I added the course modes available in the docstring to be more specific :)